Organic silicon alternating copolymer and its manufacturing method

Abstract

An organic silicon alternating copolymer which resistant to chain scission by acid or alkali is disclosed, said copolymer comprising repeat units having the formula ##STR1## wherein R represents a monovalent hydrocarbon group having 1 to 10 carbon atoms and containing no aliphatic unsaturation, R 1 represents a fluorine atom-containing monovalent organic group having 4 to 10 carbon atoms and containing at least two groups of the formula -CF 2 -, R 2 represents an alkylene group having 2 to 10 carbon atoms and said copolymer has a degree of polymerization of 1 to 10,000.

That which is claimed is: 
     
       1. An organic silicon alternating copolymer comprising repeat units having the formula ##STR15## wherein R represents a monovalent hydrocarbon group having 1 to 10 carbon atoms and containing no aliphatic unsaturation, R 1  represents a fluorine atom-containing monovalent organic group having 4 to 10 carbon atoms and containing at least two groups of the formula -CF 2  -, R 2  represents an alkylene group having 2 to 10 carbon atoms and said copolymer has a degree of polymerization of 1 to 10,000. 
     
     
       2. The organic silicon alternating copolymer according to claim 1, wherein R is selected from the group consisting of methyl radical and phenyl radical. 
     
     
       3. The organic silicon alternating copolymer according to claim 2, wherein R 1  has the formula -R 3  -C m  F.sub.(2m+1) in which R 3  represents a bivalent organic group and m is an integer having a value of 3 to 8. 
     
     
       4. The organic silicon alternating copolymer according to claim 3, wherein R 3  is selected from the group consisting of ethylene group and propylene group. 
     
     
       5. The organic silicon alternating copolymer according to claim 4, wherein R 2  is selected from the group consisting of ethylene group, propylene group, burylens group and hexenylene group. 
     
     
       6. The organic silicon alternating copolymer according to claim 5, wherein R is methyl radical. 
     
     
       7. The organic silicon alternating copolymer according to claim 1, wherein R 1  has the formula -R 3  -C m  F.sub.(2m+1) in which R 3  represents a bivalent organic group and m is an integer having a value of 3 to 8. 
     
     
       8. The organic silicon alternating copolymer according to claim 7, wherein R 3  is selected from the group consisting of ethylene group and propylene group. 
     
     
       9. The organic silicon alternating copolymer according to claim 8, wherein R 2  is selected from the group consisting of ethylene group, propylene group, burylens group and hexenylene group. 
     
     
       10. The organic silicon alternating copolymer according to claim 9, wherein R is methyl radical. 
     
     
       11. The organic silicon alternating copolymer according to claim 1 having repeat units of the structure ##STR16## 
     
     
       12. The organic silicon alternating copolymer according to claim 1 having repeat units of the structure ##STR17## 
     
     
       13. The organic silicon alternating copolymer according to claim 1 having repeat units of the structure ##STR18## 
     
     
       14. The organic silicon alternating copolymer according to claim 1 having repeat units of the structure ##STR19## 
     
     
       15. The organic silicon alternating copolymer according to claim 1 having repeat units of the structure ##STR20## 
     
     
       16. The organic silicon alternating copolymer according to claim 1 having repeat units of the structure ##STR21## 
     
     
       17. The organic silicon alternating copolymer according to claim 1 having repeat units of the structure ##STR22## 
     
     
       18. A method for preparing an organic silicon alternating copolymer, said method comprising reacting (A) an organohydrodienetrisiloxane having the formula ##STR23## wherein R represents a monovalent hydrocarbon group having 1 to 10 carbon atoms and containing no aliphatic unsaturation and R 1  represents a fluorine atom-containing monovalent organic group having 4 to 10 carbon atoms and containing at least two groups of the formula -CF 2  -; and   (B) a compound selected from the group consisting of an unsaturated aliphatic hydrocarbon having 3-10 carbon atoms and two carbon-carbon double bonds and an unsaturated aliphatic hydrocarbon having 2-10 carbon atoms and one carbon-carbon triple bond, said reaction being carried out in the presence of   (C) a hydrosilylation catalyst.